<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="cartData in ShopCartData" :key="cartData.id">
          <li class="cart-list-con1">
            <input :checked="cartData.isChecked===1?true:false"
                   @click="changeChecked($event.target.checked,cartData.skuId)" type="checkbox"
                   name="chk_list">
          </li>
          <li class="cart-list-con2">
            <img :src="cartData.imgUrl">
            <div class="item-msg">{{ cartData.skuName }}</div>
          </li>
          <li class="cart-list-con3">
            <div class="item-txt">语音升级款</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ cartData.cartPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="changeNum(cartData.skuNum-1,cartData.skuId)">-</a>

            <input autocomplete="off" type="text" :value="cartData.skuNum" minnum="1" class="itxt"
                   @change="changeNum($event.target.value,cartData.skuId)">

            <a href="javascript:void(0)" class="plus" @click="changeNum(cartData.skuNum+1,cartData.skuId)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ cartData.skuNum * cartData.cartPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a @click="deleteItem(cartData.skuId)" class="sindelet">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input v-model="checkedAll" class="chooseAll" type="checkbox">
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteAllChecked">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{ totalNum }}</span>件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ allPrice }}</i>
        </div>
        <div class="sumbtn">
          <a class="sum-btn" @click="$router.push('/Trade')">结算</a>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {
  reqDeleteCart,
  reqDeleteCheckedAll,
  reqGetCartList,
  reqGetcheckCart,
  reqPostAddToCart,
  reqPostCheckedAll
} from "@/api";

export default {
  name: 'ShopCart',
  data() {
    return {
      ShopCartData: [],
      boolean: true
    }
  },
  mounted() {
    // 初始化的时候获取数据
    this.getShopCartData()
  },
  methods: {
    // 1- 请求购物车的初始数据
    async getShopCartData() {
      const result = await reqGetCartList() || [];
      this.ShopCartData = result[0]?.cartInfoList
    },
    // 2- 修改商品的数量
    async changeNum(skuNum, skuId) {
      // 判断想要修改的数量 是否符合规范
      if (skuNum <= 0) return
      // 因为后台修改数据 是要我们传 前后的差值数量
      // 但是我们传的使是我们想要数据（这里需要计算）
      const nowNum = this.ShopCartData.find((item) => {
        return item.skuId === skuId;
      });
      if (this.boolean && skuNum >= 1) {
        try {
          this.boolean = false
          //发送请求 修改后台的数量
          await reqPostAddToCart(skuId, skuNum - nowNum.skuNum);
          this.boolean = true
          //如果成功则重新请求最新的数据
          this.getShopCartData();
        } catch (e) {
          alert(e.message);
        }
      } else {
        return
      }
    },
    // 3- 修改商品的选中状态
    async changeChecked(isChecked, skuId) {
      let checked = 0
      if (isChecked) {
        checked = 1
      } else {
        checked = 0
      }
      try {
        await reqGetcheckCart(skuId, checked);
        //如果成功则重新请求最新的数据
        this.getShopCartData();
      } catch (e) {
        alert(e.message)
      }
    },
    // 4- 删除单个购物车列表的数据
    async deleteItem(skuId) {
      try {
        await reqDeleteCart(skuId);
        //如果成功则重新请求最新的数据
        this.getShopCartData();
      } catch (e) {
        alert(e.message)
      }
    },
    // 5- 删除所有购物车已选中的商品
    async deleteAllChecked() {
      try {
        const skuIdList = this.ShopCartData.reduce((pre, cur) => {
          cur.isChecked === 1 ? pre.push(cur.skuId) : ''
          return pre
        }, [])
        await reqDeleteCheckedAll(skuIdList)
      } catch (e) {
        alert(e.message)
      }
    }
  },
  computed: {
    // 已选择的商品数量
    totalNum() {
      return this.ShopCartData?.filter(item => item.isChecked === 1).reduce((pre, cur) => pre + cur.skuNum, 0)
    },
    // 已选择的商品数量总价
    allPrice() {
      return this.ShopCartData?.filter(item => item.isChecked === 1).reduce((pre, cur) => pre + cur.cartPrice * cur.skuNum, 0);
    },
    // 全选按钮（计算得来并可以设置状态）
    checkedAll: {
      get() {
        return this.ShopCartData?.every(item => item.isChecked === 1) || []
      },
      async set(isChecked) {
        try {
          const skuIdList = this.ShopCartData.map(item => item.skuId)
          await reqPostCheckedAll(isChecked ? 1 : 0, skuIdList);
          //如果成功则重新请求最新的数据
          this.getShopCartData();
        } catch (e) {
          alert(e.message)
        }
      }
    }
  }
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;

      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 4.1667%;
        }

        .cart-list-con2 {
          width: 25%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con3 {
          width: 20.8333%;

          .item-txt {
            text-align: center;
          }
        }

        .cart-list-con4 {
          width: 12.5%;

        }

        .cart-list-con5 {
          width: 12.5%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 12.5%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 12.5%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>